intro(7)                       DG/UX 5.4R3.00                       intro(7)


NAME
       intro - introduction to DG/UX System special files

DESCRIPTION
       Man pages in this section describe various special files that refer
       to Data General hardware peripherals and DG/UX system device drivers.
       The names of the entries are generally derived from names for the
       hardware, as opposed to the names of the special files themselves.
       We discuss characteristics of both the hardware device and the
       corresponding DG/UX system device driver where relevant.

   Tape Device Names
       Tape device filenames are in the following format:

       /dev/rmt/st (adapname@devicecode(adapaddr[,adapid]),deviceid,d)
       [compression] [density] [n]

       where:
       adapname    is the SCSI adapter name [see st(7) for a list].
       devicecode  is the adapter's device code (in hexadecimal).
       adapaddr    is the address of the adapter (in hexadecimal).
       adapid      is the adapter's SCSI ID (range 0-7, default=7).
       deviceid    is the tape drive's SCSI ID (range 0-7).
       d            is the tape drive's unit number (range 0-7).
       compression  is c (data compression enabled) or u (disabled).
       density      is h (high), m (medium), or l (low).
       n            means do not rewind the tape after closing the device.

       If you do not specify h, m, or l, automatic density selection occurs
       when reading, and the current setting of the tape drive is left
       unchanged when writing.

   Physical Disk Device Names
       Physical disk device filenames are in the following format:

       /dev/[r]pdsk/class[(adap]@device-code(addr[)],[i],d)
       or
       /dev/[r]pdsk/name

       where:
       r            means a character special interface to the disk (as
                    opposed to block special).
       class        is the disk type (such as sd, cied, or cimd).
       adap         is the controller name.
       device-code  is the controller device code (in hexadecimal) for a
                    physical disk.
       i            is the SCSI ID number of the disk (if it is an SCSI
                    device).
       d            is the unit number on the controller (starting at 0) for
                    a physical disk.

   Virtual Disk Device Names
       Virtual disk device filenames are in the following format:




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intro(7)                       DG/UX 5.4R3.00                       intro(7)


       /dev/[r]dsk/name
       or
       /dev/[r]dsk/vdm(name,generationnumber,systemid,duplicatenumber)

       where:
       r                  means a character special interface to the disk
                          (as opposed to block special).
       name               is the virtual disk name (such as root or usr).
       generationnumber  is a number used in identifying the virtual disk
                          that is assured of being unique among virtual
                          disks created on one machine.
       systemid          is the system identification number of the system
                          upon which the virtual disk was originally
                          created.
       duplicatenumber   is the number used to distinguish between
                          otherwise identical virtual disks (same name, same
                          generation number, same system ID).

EXAMPLES
       Following are examples of tape device names:

       /dev/rmt/st(cisc@28(FFFFF300),4,0)
       /dev/rmt/st(cisc@28(FFFFF300),4,0)n
       /dev/rmt/0
       /dev/rmt/0n
       /dev/rmt/st(insc@E(FFF8A000),4,0)mn

       Following are examples of physical disk device names:

       /dev/pdsk/1
       /dev/pdsk/sd(cisc@28(FFFFF300),1,0)
       /dev/pdsk/sd(insc@7(FFF8A000),0,0)
       /dev/rpdsk/sd(insc@7(FFF8A000),0,0)

       Following are examples of virtual disk device names:

       /dev/dsk/swap
       /dev/dsk/udddoc
       /dev/dsk/usroptX11
       /dev/dsk/vdm(usroptX11,2C690B10,373A2264,0)

SEE ALSO
       dsk(7), rdsk(7), st(7).
       Customizing the DG/UX System.













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